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A disorderly persons offense in Michigan is punishable by up to 90 days in jail and/or a fine of $500. Given that I am assuming this is his first offense, it is likely that he will be able to resolve this without getting a conviction on his record. Usually in first offender situations with a minor charge like this, he would be able to get some kind of diversion or deferral program, where if he completes the program successfully, the charge ends up getting dismissed. I'd suggest that he gets a lawyer to negotiate on his behalf with the prosecutor if either of you is able. Many lawyers will do these types of cases for a flat fee so it wouldn't be terribly expensive. While he can try to negotiate for it on his own, it is generally easier to have a lawyer do it, especially when a person is concerned about keeping their record clean.